I have installed several instances of odoo 8.0 (rc1). On nearly all I have the same problem with ACL's.

The problem is a complete ignoration of a part of the Access rights of user groups, mainly towards editing and viewing other users or contacts. So even with full access rights, any different user as the super user can't see any other user but himself. Nor he can ad a new user or a new contact. This behavior I already experienced in saas-5 version. I'm not shure but the difference from a site where the problem exists to a site which none of such issue could be the installation of the bookkeeping and the localization for Switzerland. But maybe another module could be the trigger as well. In the log I can't find any related messages.